Improvement in gaging and centering tools



2 Sheets-Sheet 1.

F. A. RICH.

meme AND cmrmmm TOOLS. No. 188,756. Patented March 27,1877.

2 Sheets-*Sheet 2. F. A. RICH.

GAGIN'G AND CENTERING TOOLS. No. 188,756. Patented March 27,1877.

Wi'fneJsaJ/ N PEI'ERS. PflOTD-LITHOGRAPHER, WASHINGTON. D C,

UNITED STATES PATENT OFFICE FRANCIS A. RICH, OF, GRAND RAPIDS, MICHIGAN,ASSIGNOR OF ONE- THIRD OF HIS RIGHT TO JOHN H. JONES, OF SAME PLACE.

IMPROVEMENT IN GAGING AND CENTERING TOOLS.

Specification forming part of Letters Patent No. 188,756, dated March27, 1877; application filed February 23, 1876.

To all whom it may concern Be it known that I, FRANCIS A. Bron, of thecity of Grand Rapids, county of Kent and State of Michigam-have inventeda Centering Compass and Gage, of which the following is a specification:

My invention relates to an improvement in centering compasses and gages;and it consists in the arrangement and combination of clamps, scribers,stutt-bolts, and thumb-nuts that will be more fully describedhereinafter, whereby a cheap, simple, and effective instrument isproduced for centering, leveling, boring, turning, and drilling allkinds of machinery.

Figures 1, 3, 4, 7, 8, 9 show my device as applied to different kinds ofwork. Figs. 2, 5, 6 are detail views of the same.

Letters D and F represent two clamps, which are secured together by thescrews or and thumb-nuts c, the part D being thinnest, and having arecess, d, in one end for convenience of opening, as shown in Fig. 2. Inthe center of the inner sides of these clamps is made a groove, J, forthe reception of a flat bar, a rod, or bolt, to which the clamps are tobe fastened. To the part Fis swiveled a pin, B, which has a hole throughit at an angle of about twenty degrees to receive a scriber, A, which isheld in any desired position by the thumb-screw e.

The pin B is held in any desired position by means of a set-screw, 9,after it has once been adjusted for the scriber. Passing over the twoscrews a are the two slotted rightangular plates, :10, which are used ingaging,

as shown in Fig. 7, and may be used either upon straight or curvedsurfaces, the rod 0 having a marker, C, projecting out from its side forthis purpose.

The hole through the pin B is made at an angle of about twenty degrees,so that the scriber can be set for small or large circles, as shown inFigs. 3, 8, and 9.

In Fig.3 my device is shown attached to a rod, L, which is held in alathe, with the scriber A, in position for centering on the face-plateG. In Fig. 7 the gage is shown adjusted for drawing an inside circle;but outside circles may be made just as well by reversing the parts. InFig. 8 the gage is shown attached to a drill, S, which is fastened inthe spindle H. The scriber A is set for leveling the piece P on thetable M, and can be used as well with a ratchet as a press-drill. InFig. 9 the cone R is shown attached to the sharp end of the rod 0, andthe scriber set to an outside angle to draw a circle on the piece T. Thebottom plate I is adjusted to form a surface-gage to the rod 0. To thepart D is secured a stationary scriber, K, which, with the movablescriber A, forms a compass.

Having thus described my invention, I claim- The combination oftheclamps, D F, screws a, nuts 0, head or pin B, scriber A, set-screw g anda, round or flat bar 0, substantially as shown and described.

FRANCIS A. RICH.

Witnesses:

J. H. JONES, M. B. COOPER.

